While Stefani didn't crack a smile, Rossdale appeared much more relaxed, even waving at paparazzi after their 45-minute meeting. The exes didn't speak as he drove off.

AKM-GSI

AKM-GSI

AKM-GSI

Rossdale and Stefani's divorce was finalized last month, after 13 years of marriage. ET learned that Stefani likely wasn't too happy with the terms of the settlement, specifically with regard to the section regarding the family's house. According to documents obtained by ET, Stefani and Rossdale will split the profits made from the sale of their home in Beverly Hills, although Stefani made significant upgrades to the property, including an entire new wing and a guest house. Selling the house also means she will have to uproot their three children -- Kingston, 9, Zuma, 7, and Apollo, 2 -- whom the two share joint physical and legal custody of.

But it wasn't all bad news for the No Doubt frontwoman. Although Rossdale was entitled under California law to a 50 percent stake of all the money Stefani earned and assets she accumulated while the two were married, he allowed Stefani to keep what she had acquired on her own. Rossdale has a reported net worth of $35 million, while Stefani is reportedly worth $120 million.

Still, the former couple's breakup was reportedly less than friendly. Rossdale reportedly had a three-year affair with the family's nanny, with Stefani "mortified, livid, and embarrassed" over her then-husband's alleged infidelity, and "completely devastated," Us Weekly reported last November.

"If I could, I would just tell you everything, and you would just be in shock," Stefani told The New York Times about their split in March, adding that she doesn't discuss the reasons behind the breakup partly to protect her three sons. "It's a really good, juicy story."

Stefani has now, of course, moved on with 39-year-old country star Blake Shelton, whom she's been dating since last November.

PHOTOS: Blake Shelton and Gwen Stefani together

37PHOTOS

Blake Shelton and Gwen Stefani together

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EXCLUSIVE PICS: Gwen Stefani looks tense meeting with Gavin Rossdale in first sighting together since split

EAST HAMPTON, NY - AUGUST 20: Blake Shelton and Gwen Stefani attend the Apollo in the Hamptons 2016 party at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)

EAST HAMPTON, NY - AUGUST 20: Blake Shelton and Gwen Stefani perform at Apollo in the Hamptons 2016 at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Kevin Mazur/Getty Images for The Apollo)

EAST HAMPTON, NY - AUGUST 20: Blake Shelton, Gwen Stefani and Ronald O. Perelman attend Apollo in the Hamptons 2016 at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Kevin Mazur/Getty Images for The Apollo)

EAST HAMPTON, NY - AUGUST 20: Blake Shelton and Gwen Stefani attend Apollo in the Hamptons 2016 at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Kevin Mazur/Getty Images for The Apollo)

LAS VEGAS, NEVADA - MAY 22: Blake Shelton and Gwen Stefani are seen on stage during the 2016 Billboard Music Awards held at the T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by JB Lacroix/WireImage)

GLENDALE, AZ - DECEMBER 27: Gwen Stefani and Blake Shelton wave to fans prior to the NFL game between the Green Bay Packers and Arizona Cardinals at University of Phoenix Stadium on December 27, 2015 in Glendale, Arizona. (Photo by Norm Hall/Getty Images)

GLENDALE, AZ - DECEMBER 27: Musicians Gwen Stefani and Blake Shelton attend the NFL game between the Green Bay Packers and Arizona Cardinals at the University of Phoenix Stadium on December 27, 2015 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)

GLENDALE, AZ - DECEMBER 27: Musicians Gwen Stefani and Blake Shelton attend the NFL game between the Green Bay Packers and Arizona Cardinals at the University of Phoenix Stadium on December 27, 2015 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)

Cast member Blake Shelton and singer Gwen Stefani laugh at the party following the premiere for "The Angry Birds Movie" in Los Angeles, U.S., May 7, 2016. REUTERS/Mario Anzuoni